The glyph is a canonical composition of the glyphs Glyph for U+006FLatin Small Letter O, Glyph for U+031BCombining Horn. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+01A1 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Ơ (lowercase ơ) is one of the 12 Vietnamese language vowels. It represents the sound [ə].
As with most special Vietnamese letters, this letter is not well-supported by fonts and is often typed as either o+ or o*. The VIQR standard is o+.
On the Windows default Vietnamese keyboard Ơ can be found on where the ] key is on a US English keyboard layout.
Because Vietnamese is a tonal language this letter may optionally have any one of the five tonal symbols above or below it, as in phở.
Ờ ờ
Ớ ớ
Ở ở
Ỡ ỡ
Ợ ợ
Representations
System
Representation (click value to copy)
Nº
417
UTF-8
C6 A1
UTF-16
01 A1
UTF-32
00 00 01 A1
URL-Quoted
%C6%A1
HTML hex reference
ơ
Wrong windows-1252 Mojibake
Æ¡
Encoding: CP1258 (hex bytes)
F5
Encoding: GB18030 (hex bytes)
81 30 9B 31
AGL: Latin-4
ohorn
AGL: Latin-5
ohorn
Adobe Glyph List
ohorn
digraph
o9
RFC 5137
\u'01A1'
Bash and Zsh inside echo -e
\u01A1
C and C++
\u01A1
C#
\u01A1
CSS
\0001A1
Excel
=UNICHAR(417)
Go
\u01A1
JavaScript
\u01A1
Modern JavaScript since ES6
\u{1a1}
JSON
\u01A1
Java
\u01A1
Lua
\u{1A1}
Matlab
char(417)
Perl
"\x{1A1}"
PHP
\u{1a1}
PostgreSQL
U&'\01A1'
PowerShell
`u{1A1}
Python
\u01A1
Ruby
\u{1a1}
Rust
\u{1a1}
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